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NAME

       sched.h - execution scheduling (REALTIME)

SYNOPSIS

       #include <sched.h>

DESCRIPTION

       The  <sched.h>  header  shall  define  the sched_param structure, which
       contains the scheduling parameters required for implementation of  each
       supported  scheduling policy. This structure shall contain at least the
       following member:

              int       sched_priority        Process execution scheduling priority.

       In addition, if _POSIX_SPORADIC_SERVER or _POSIX_THREAD_SPORADIC_SERVER
       is  defined,  the  sched_param  structure  defined  in  <sched.h> shall
       contain the following members in addition to those specified above:

              int             sched_ss_low_priority Low scheduling priority for
                                                    sporadic server.
              struct timespec sched_ss_repl_period  Replenishment period for
                                                    sporadic server.
              struct timespec sched_ss_init_budget  Initial budget for sporadic server.
              int             sched_ss_max_repl     Maximum pending replenishments for
                                                    sporadic server.

       Each process is controlled  by  an  associated  scheduling  policy  and
       priority. Associated with each policy is a priority range.  Each policy
       definition specifies the minimum priority range for  that  policy.  The
       priority  ranges  for  each  policy  may overlap the priority ranges of
       other policies.

       Four scheduling policies are defined; others  may  be  defined  by  the
       implementation.  The four standard policies are indicated by the values
       of the following symbolic constants:

       SCHED_FIFO
              First in-first out (FIFO) scheduling policy.

       SCHED_RR
              Round robin scheduling policy.

       SCHED_SPORADIC
              Sporadic server scheduling policy.

       SCHED_OTHER
              Another scheduling policy.

       The values of these constants are distinct.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

              int    sched_get_priority_max(int);
              int    sched_get_priority_min(int);

              int    sched_getparam(pid_t, struct sched_param *);
              int    sched_getscheduler(pid_t);

              int    sched_rr_get_interval(pid_t, struct timespec *);

              int    sched_setparam(pid_t, const struct sched_param *);
              int    sched_setscheduler(pid_t, int, const struct sched_param *);

              int    sched_yield(void);

       Inclusion of the <sched.h> header may make visible all symbols from the
       <time.h> header.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <time.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the  referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .